ATT gophone I am reporting over charges and little or no data. I switch to Sprint with a balance 80.00 and no refund, however they did let me keep my phone number,but new phone has periodically over heat issues San Diego California

I was with Att for a year. The first issue was another Angela Cove. I could not call out but could receive calls. The second problem is they had her information on my line and I was paying for it. I feel that I was paying double as my bill was $45.00 dollars , yet my data was used up before the month my account showed 80.00 dollars a;ways after I paid. My connection to Att would not show up or it was cut off. I am still having this problem. I feel I have paid for that number. I have a HTC now, the old phone was an Blu Advance.